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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d834b0c31335961c210bd06945cef3f4aaa24c4cf1bbd250c575d3785a17b33' 
  AND token = '+37LTX39kLDejfqqksMyTFMxZUH5cnUFLFd51J2vtU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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