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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88301eee6cd67fdd766956ed0027e7c454e50101af1a1196310fcf713fbd898' 
  AND token = '1sERwlXswtlWxyG39jY3mWCUMGVV57H1fpOp5pcLZC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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