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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9deb2c671684b3ba2e9f400adf06eae66c38bc567bb75b58a63d23c81bdf5e6b' 
  AND token = 'uHZoE9oGTRjgQQvyOHctb7uYyfhn9WNI2CP/NvVwG6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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