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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192cef9f8ccc6e8be2323a652002e2b917b713989b84f0245145cbdd37f58c77' 
  AND token = 'PluFGq8SfisYop0OrzywO9EMSTPPh/J2JMdkEHgbqWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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