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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73de6d478a2053a619d383799777b0e58573aef25e9766f9e30b8a2f33bd4cc3' 
  AND token = 'rw8kK6B8iDQ0iBAZmMx+Pi4uhL8ot1djiqSIE1bTmPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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