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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97bd177c7b2582051b75251316c53ad84e65d7f52fc11898da9f8c8f1865fb80' 
  AND token = 'T07xh/PSzBdAi8EtxBq9xeVI3i+4MttkPc1K5ydgvMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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