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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0df9f4d21d71e7c2a04bfae3ce5c4b08de2cf530383f70a3ae23e374d3d1ca6' 
  AND token = 'majG8ovXcw+0HvLAHSVBI5YbVpUpXNSBwC98H0CqHpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00111

JSON explain

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