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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d35a0b1a8ed28af1fb0b509b350fa238d90e25bcd4f9c8d85b31cca3162df2' 
  AND token = 'aR2PmKB//1TMIGHG15CWd8TdjmhJZO1Cwy2N9KVWpdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}