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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3583ca4b1ddf9bf35766a8c78c93732ee4edb3895a649b33d0a4b03eecd743' 
  AND token = 'ZT5GAA+Wo1sM4oxX+WZol7VO7o25BKdyMH/95kJXQpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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