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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7c93de988217ffcfdfee48a88ba97ae2b9791aa6a879d9187b1bc5e34f2a19' 
  AND token = '58FEgSFnB/nJXTjjYUqBmocqnEUmdh7tIEKtIgo/zW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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