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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f606bf9c3643a12e466679626521d0447e2b3ae45a02ad29cdcfb652cb0c3084' 
  AND token = 'JkdkDpqwAVlsBwn+Gd8+Lu3LmB+L9+nxrm8tX86iI/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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