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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a3aab6410e7b03fbf629c95f975f317fed8b3b7f40984e02b0390b1aacdf8a' 
  AND token = 'eeaVYeOG8FN02sXxogKe4fNVA0CGKHCXJv7O2dBo71M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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