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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7dcadc41d02bf5f378168d0c6693d93c08a384be8dfff4faf24403ec47c0d8' 
  AND token = '+2z7jmQsY2wLoHcvSlnDsckyqwi7iW6JANRIixDZ29o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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