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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d6e96773619d26430d689eeea0b380044106ef5166c413a2a7f2bf51e7ac2f' 
  AND token = 'xfurjzFc5C8zwBKi7LDNCJemk/yOpEQdGWlnge6LAv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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