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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce8b83facab0b4de0001997ef8d4b04c255cce1d208d90541d83eb1425c29d9' 
  AND token = '0PQhdqp/CX1YU30ouLHy5YMmQ2x+gHpHyW/oMvRHCYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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