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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49fb70746a08f562379758fb79c01df16ffb474c69399df92b63647a9ea66105' 
  AND token = 'F+gWJxHsqYHHYR4nN4A4NlqLw+gfEL4K5CawFItGdOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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