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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60b51fe695faa1eefb573dae9848ac7020333a2b5205e7f6893e279c28b5a15' 
  AND token = 'LPe0GZluJ2k3bJpHCf1rvaedTeBZlXg0+zoBZwPTXg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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