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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c3cab1a61cde470b10b95a5f7b8fd190c4383c194409c0e66ff22179e4468a' 
  AND token = '8sPvTxH4fwUVA4cXV9kbqlXGJeG+q0TS/NMnFcg4Vi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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