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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c55998cf1357e648bd9ea680b005a3c5f2c88a8a24cd35b979b822991cd98e3' 
  AND token = 'f+X/AnM4JxREDPZ4qsgY7/nu9dWHj4BNZ7t/gE5YFBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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