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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97e96d6f718f72c50e14b636a39101c9e99c5f1205145bbfa5bd686329e20eb' 
  AND token = '7XQB8Xv5sNn6fYzcceuxWfBK5x8oc53I+KAL0O4B3G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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