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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7076422c78b81d205589b2eb346ed3d38275e83a806c92dc037e782697f99d' 
  AND token = 'PtTFJg3g6kmo6HSgg7pcrYObRvbPvjymY3JEKMV0aU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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