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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25fc86d2894ee723bbf984494356bf8d9fb42f12c277cf3d006ea867a5d5a0b' 
  AND token = '+fbp9fZwz2Zyo/jX01j+b6ddoK9OWjiKpFFpLsIk0kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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