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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec2c0aa3d1140eab90e6ea72ef3c3a295f94863f6bad8f64b5ff38df5c630488' 
  AND token = 'zA4mG8pmAMZBjU2WXywn+c1jdBcDDGlCif2RtLNoLro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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