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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ddd8159f6ca333039f4a0f793cf48779d4078be4517077959dc55279f42f5c' 
  AND token = '0gLN20vcon5deFD4v6ugGeWbdArnLDxJm6d/r3FCfi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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