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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c7749c9129e8f4637178364aab494faf2490866a9f0bcf3278527bbeea3d8e' 
  AND token = 'o6rCoPalV+qX/RLmT9PM1xo1klaKLGIOKEuvMKsp9G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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