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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e728667b40cdd581f9dc52e49df7a4e520eb19d38736d9fbbe7a0bd084de7e7' 
  AND token = '8d4qUfaaZN5vMIPSDqCzzuv/2UGMFTh2ci8ycEb5440=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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