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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb2d13d61b0642b9f229f0db6e20e29cada47191cc73de92606b6e02dd49411' 
  AND token = 'IvLLIU8j4kvVa+XO4t7ZQR8P97MxDvtEQSNikG/p64E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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