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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bda061893befbbc660d62c5890f5d3687f7f584b25dd9a9b2bdc62718cdd2a9' 
  AND token = 'G6XmQ1s0ENtJvpvgJHmIBi17UkGRUsz9YFxXIvUzBK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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