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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ea5d2f1206a4fb62a07409ee60f2aea0c099ab0afd90b23d2c5561d37b7d8b' 
  AND token = 'aSgMVz03Gn5wJSOoY98F9pqdJR1ezzsvijowaGmoC64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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