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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22eea856b23b2539efacb23a63bc88f2230016f6ee0424dfc662cd996173697' 
  AND token = 'fc5zcr/mkp5mlLrSnIpcBPP6w487h23gV64pQVqrVAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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