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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bcf3238dce07c71dc280d26489c656d611579510aca8889d83f1803284b6bb' 
  AND token = 'Uphs1vwvm0yV/flqQFIGRa3dePTy7e60ZIgMZQuAcA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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