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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac5bf9d997bc3d786baeb4e143de54f7182d97211fe6605608fb6053a357b6b' 
  AND token = '+HglL4hv3dMK+kk6Rnf7uuCe0EGCJML7sX6qQy3t9mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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