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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7a2c64ec04960b81fb6face01fa61b6f0b04d93e836f6a5d02a216adab2b7f' 
  AND token = 'Ybf+CIT9Km6CTpQOrrth2uBswgbC9Wxl3sGQWK+aTyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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