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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df33275bcf1bbb853475b3aac6c6577fcc9fbeadf437fb27bbe31b0f53cea843' 
  AND token = 'fioJt1T/lORH4rnbRNeuMLFsgB2fTTY3eg1WvV0PMCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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