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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7653d9e281f850ff07f7f5899f17875bbaeada4ea21c47573c3e4a03cb8c7c' 
  AND token = 'r9XbTxbKvf7FI5YtvQuXCU2ggesOO6udWX1oE3SqVeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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