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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23635d97311334bdfb9cc06934e8afd5d0b8d5957ebef8b6d53fd97eab3f2943' 
  AND token = 'o5QAhHaCyzjgHqojb/Q/rAP7xpMvefwDYyeHP1K5IcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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