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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f1a219d76fff142df05d063a6be97d46a07bb8796481e74d52b216047945c1' 
  AND token = 'dLj7roiIunH+ua7OglukJ3eS8O68CbfH0mlP1DUXEDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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