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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84c02902e2139b4c0191b6dbcd196e18e2249a6431c6d609e2ee38ff58d0fdd' 
  AND token = 'a8R0kA+xSuO9NonU6iN6vZlpuZkykxtCQN655yRirLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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