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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690f777ce8e2834a0c4b94ac0dc54d51c9fb7a01e943cc32b4a5baa6089f8bc5' 
  AND token = 'u3MVD0DMuLWMu0rLpesVf18OnMg02GDAc3GtUUZ64Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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