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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '958c3ad9c40d74e724311648a38a60c4646a84acbc4a3d506694c62f2e818115' 
  AND token = 'n8jZEREdu/E+yurWeQZVYGr/mXycsb11U6b2lwta/rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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