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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67df586684bb47c988d7f8a4d44b91267e7a3c904bd4177b5e3496f05c6c48be' 
  AND token = 'AFsOVbdmk79CjuV9sKaBH2T4FKNCquI7aM4fBnJphyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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