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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b933b9da845e563c9eaba05f7ef086602f53df65b80640db852660e926bb0258' 
  AND token = 'a9pPc2E52GVwhepYg+G2zLvRV2Jfdut2/KEtbU5cvms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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