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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92f43b61c75d610f882a18150a46d86aa94e7eb32c422a808d7af6488c148a3' 
  AND token = 'qTGcnAZ04QWsYFFjyogriruMlU3r6Vx+tzsxohuEmXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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