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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3a40836dc11ff3f54ec83b945e45fa2b772fd91f856aea00f261fac11b7d0e' 
  AND token = '1El1hP1SqVHEhDfo6xj3bM1qIMMHpKXxaqNV+c6y9TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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